Abstract: A fluorescent lamp comprises at least one layer of a quad-phosphor blend for emitting visible illumination having a white color. The quad-phosphor blend comprising a first and second green emitting phosphor component with each green emitting phosphor component having different visible emission spectrum principally in the 520 to 560 nm wavelength range. A third blue emitting phosphor component has an emission spectrum principally in the 440 to 470 nm wavelength range. A fourth red emitting phosphor component has an emission spectrum principally in the 590 to 620 nm wavelength range. The first green emitting phosphor component is a alkaline earth metal activated phosphor and the second green emitting phosphor is a rare earth activated phosphor wherein the relative proportions of the phosphor components are such that an enhanced color rendering index is produced as compared to tri-component blends formed from three of the phosphor components.

Abstract: Disclosed is a large size Y.sub.2 O.sub.3 :Eu lamp phosphor as a red component for a water degradation resistant blend of fluorescent phosphors having large sized green phosphor particles and the method for making by blending yttrium oxide and europium oxide with fluxing agents, firing, milling the fired phosphor; sieving the milled phosphor to obtain a phosphor with an average particle size greater than about 5 by Coulter Counter to produce a sieved phosphor, and encapsulated a conformal coating of gamma alumina on said sieved phosphor by vapor chemical vapor deposition to form a resulting coated Y.sub.2 O.sub.3 :Eu phosphor with additional phosphor components including a green phosphor to form a lamp phosphor blend, and applying the blend to a lamp as a water based suspension.

Abstract: A method for removing contaminants from an arc tube includes introducing an inert gas into the arc tube through a conduit extending through the lamp tubulation and exhausting the gas through the space between the conduit and the wall of the lamp tubulation. Contaminated gas thereby always flows away from the arc tube. The arc tube can be heated during the gas flushing process to release adsorbed water and vaporize volatile oxides. Gas is preferably flushed through the lamps tubulation during and after press sealing of electrodes into the arc tube to remove contaminants introduced during press sealing.

Abstract: In process for forming a coating of phosphor particles on a fluorescent lamp glass, a polymer is deposited on the phosphor particles and the phosphor particles are entrained in a carrier gas with the polymer in a non-adhering state, and then the phosphor particles are coated on the fluorescent lamp glass with the polymer in an adhering state for retaining the phosphor particles on the fluorescent glass and, the coated fluorescent glass is heated to a temperature above the decomposition temperature of the polymer for removing the polymer and to form a coating of phosphor particles on a fluorescent lamp glass.

Abstract: This invention concerns the addition of fibrous alumina material to a phosphor or phosphor mixture before fluidization as a means of increasing the cohesiveness of the phosphor or phosphor mixture. The increase in cohesiveness can be controlled by varying the concentration of the fiber in the mixture.

Abstract: A compact low pressure mercury vapor discharge lamp which utilizes an amalgam for reducing the vapor pressure of mercury by absorption. The lamp has a tubulation positioned at a location spaced from the lamp electrodes which is in communication with an arc sustaining gas and includes a container for retention of liquified amalgam within the tubulation. The mercury vapor from the electrical charge sustaining gas is in communication with the amalgam for absorption.

Abstract: In method for enhancing heat transfer in a bed of powder comprising cohesive Geldart type C particles confined by a wall of a vertically oriented container and being fluidized by the upward flow of fluidizing gas through the bed of powder, heat is transferred between the bed of powder and the wall of the container, and, prior to fluidizing the particles, the fluidizing gas is selected so as to comprise a sufficient amount of helium, hydrogen, or mixtures thereof for obtaining a thermal conductivity of the fluidizing gas of at least four times that of nitrogen for enhancing heat transfer between the wall and the bed.

Abstract: In a mercury vapor arc discharge tube having a pair of electrodes, an emissive material disposed on the electrodes consists essentially of a single phase compound of Ba.sub.x Sr.sub.1-x Y.sub.2 O.sub.4 where x is from about 0.25 to about 0.95.

Abstract: A fluorescent lamp including a lamp bulb which has been coated with phosphor powder which has been ground in an attritor to reduce the powder weight without loss in light output and light maintenance. A process to produce such a fluorescent lamp utilizes a particular sequence of steps including firing, milling, attritor milling, and washing to produce an improved stir-in alkaline earth halophosphate.

Abstract: In a process for reducing the dust content of cobalt metal powder, the starting cobalt powder containing dust is milled for a sufficient period of time to increase the bulk density and decrease the dust content while substantially maintaining the original Fisher Sub Sieve Size.

Abstract: A skin tanning fluorescent lamp having a coating of a uniform and homogeneous deflocculated physical mixture of a first and second phosphor where the first phosphor has a desired emission in the spectral region from about 320 to about 400 nanometers and the second phosphor has a desired emission in the spectral region from about 280 to about 320 nanometers, said first phosphor has a first isoelectric point at a first pH and the second phosphor has a second isoelectric point at a second pH. The first and said second pH form a range. The deflocculated coating is stabilized by deflocculating the first and second phosphors at a third pH sufficiently outside of range to produce a resulting coating consistently having desirable emission during production.

Abstract: In a method of preparing an alkaline earth halophospor having an antimony content greater than about 0.70 weight percent, a uniform mixture of starting raw materials is fired with already fired phosphor of the desired alkaline earth halophosphate so that the already fired phosphor is refired in an inert atmosphere containing volatile species from the uniform mixture of starting raw materials.

Abstract: A scandium halide and alkali metal halide discharge lamp has a chemical fill in the arc tube comprising an inert starting gas, mercury, alkali metal iodides, scandium iodide and platinum metal as an additive for reducing the tendency of the lamps to discolor during operation.

Abstract: In a method for detecting the fluidity of particles in a vertically extending bed of fluidized particles, an electric charge which is generated on the particles is dissipated through an electrically conductive means in the fluidized bed to give an indication of the fluidity of the particles in the bed.

Abstract: A phosphor of the type utilized in a fluorescent lamp and which includes core elements barium, lead, silicon, and oxygen where a continuous, conformal outer coating of hydration and solubilization resistant aluminum oxide, which is impermeable to migration of the core elements, surrounds the core whereby the outer surface of the core is substantially entirely free of the core elements.

Abstract: The present invention is directed to an inexpensive and compact apparatus adapted for use with a .sup.196 Hg isotope separation process and the conversion of anhydrous HCl to aqueous HCl without the use of air flow to carry the HCl vapor into the converter system.

Abstract: An arc tube for a high pressure metal vapor discharge lamp is provided. The arc tube of the present invention comprises a tubular ceramic envelope; a chemical fill within said envelope; a seal button at each end of said envelope; said seal button having an aperture therethrough for receiving a feedthrough member; a feedthrough member having an electrode projecting therefrom passing through said seal button aperture and being oriented such that the electrode projects into said tubular ceramic envelope, said feedthrough member being sealed into said seal button by means of a fritless seal between said seal button and said feedthrough; and sealing frit material sealing said seal buttons into the ends of said tubular ceramic envelope. A method for fabricating the above-described arc tube and high pressure metal vapor discharge lamp including the above-described arc tube is also provided.

Abstract: A simple rate equation model shows that by increasing the length of the photochemical reactor and/or by increasing the photon intensity in said reactor, the feedstock utilization of .sup.196 Hg will be increased. Two preferred embodiments of the present invention are described, namely (1) long reactors using long photochemical lamps and vapor filters; and (2) quartz reactors with external UV reflecting films. These embodiments have each been constructed and operated, demonstrating the enhanced utilization process dictated by the mathematical model (also provided).

Abstract: The present invention is directed to an apparatus useful for fluidizing small particulate solids having a diameter of less than about 50 microns in average particle size, and at least partially enveloping these small solids with a coating material or a precursor thereto. The basis apparatus of this invention includes a cross-current multi-stage fluid bed reactor having N fluid beds in flow communication with one another, wherein N.gtoreq.2.

Abstract: A method is disclosed for recovering oxalate from oxalate containing solutions containing complexes of iron and chromium. The method involves adjusting the pH of the solution to from about 1 to 2, adding calcium chloride in an amount equal to at least about 3 moles per mole of iron, and digesting the resulting calcium chloride treated solution at at least about 50.degree. C. for a sufficient time to form a solid consisting esssentially of calcium oxalate, followed by separating the solid from the resulting mother liquor.